After getting my coach in 2013 and making many trips to Junction City for one repair after another, most out of my field of repair so we did not get a lot of alone time in the coach.
The back lighting section is on one switch 30A relay fuse and would go off and on, so the first thing I did was to change out all of the halogen light 10W to LED's to cut down on the heat. (17 lights and BR fan) on that switch.
Well the problem was still there, so I pulled out the fuse block and removed one side panel to find the wires coming out of that block were burned and a new updated block 300-400$ so I went up to Ace and got a 30A inline water tight fuse holder for $2.49 cut off 2" of the burned end and attached it right to the main 12v power lug, problem solved.
Now I don't have to listen to the wife say, the light are out again.